exam Maths Puzzle Numerical Ability

Solve by completing the square.

x^2 - 16x + 63 = 0

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exam Other Question

Please help.

Diameter of a circle. If the diameter of a circle 1.3 X 10^-12 meters, then what is its radius? Evaluate the expression for the given value of the variable.
2
3x - 6x +9

x=-2